weston



(No Model.) 3 Sheets-Sheet 1.

E. WESTON.

REFLEGTING GALVANOMETER. No. 892,476. r Patnted Nov. 6, 1888.

Maw mm N PETERS. Phu'wkilhognphnr. \Vashmglon. o. c,

(No Model.) 3 Sheets-Sheet 2.

E. WESTON.

REFLEGTING GALVANOMETER, No. 392,476. Patented Nov. 6, 1888.

WITNESSES: l/V VENTOH,

ATTORNEY,-

N. FETERS. Pnnlwumu m hur, Washinglon. D. c.

(No Model.)

3 Sheets-Sheet 3.

B. WESTON. REFLEOTING GALVANOMETER.

P tented Nov. 6, 1888.

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" ATTUA'NE).

N. PETERS. Phnlo-Lilhuguphcr, Wflshinglnn. D. c

of the tripod-base E are the usual levelingiJNrrnn dramas PArnnr EDWARD WESTON, OF NEWVARK, NEW JERSEY.

REFLECTING -GALVANGMETER.

SPECIPICATTON forming part of Letters Patent No. 392,476, dated November 6, 1888.

Application filed August 17, 1888.

To all whom it may concern.-

Be it known that I, EDWARD \VESTON, of Newark, Essex county, New Jersey, have invented a new and useful Improvement in Reflecting-Galvanometers, of which the following is a specification.

My invention relates to that class of galvanometers wherein the magnet-needle is supported so as to vibrate between two coils, and is provided with a mirror wherefrom a beam of light is reflected upon a suitable scale.

My invention consists in the arrangement of the coils and devices for supporting the same in the standard, in the tubular core and arrangement of the mirror and needle therein, and in the controlling-magnet in disk form, together with other combinations and subcombinations, all as hereinafter more particularly set forth.

In the accompanying drawings, Figure l is a front elevation of my galvanometer. Fig. 2 is a plan view. Fig. 3 is a detailed perspective View of the inner end of the tube. Fig. 4is a vertical section of the instrument on the line a: a of Fig. 2. Fig. 5 is a horizontal section on the line 1 y of Fig. 4-. Fig. 6 represents the sight-tube detached. Fig. 7 is a vertical section on the line a z of Fig. 4-.

Similar letters of reference indicate like parts.

The standard of the instrument consists of the circular shell A,supported upon the pillar B. At the lower end of the pillar is a tapered projection, G, entering a correspondingly- :t'ormed opening in a sleeve, D, in the center of the tripod-base E. Around the proj cation 0 is cut a groove, F, into which enters the end of the clamping-screw G, which passes through the sleeve D. 7h en the screw G is loosened,the standard may be freely turned on the projection 0 as a pivot, and when the screw G is tightened the standard is thus clamped in position. At the ends of the arms screws, H. The coils I are wound upon spools or bobbins J J, (of hard rubber or other insulating material,) which are inserted in the ringseat formed by the shell A from opposite sides, as shown.

K, Figs. 3, 4C, and 6, is a metal tube provided Serial No. 282,938. (No model.)

near one end with a circular flange or collar, L. In this flange is formed a radial slit or opening, M, andin the tube Kis formed a slit or opening, N, which meets the opening M, Figs. 3, 4, and 6. The tube K is threaded at both extremities and is closed by a glass cover at O.

P is a short tube internally threaded at one end to receive the threaded extremity of tube K. At the opposite end the tube P is flared or enlarged, and is provided with an external flange, Q, and a glass cover, R. In the standard above the shell A is a socket, S, which receives the vertical tube T. At the upper end of tube T is a cap, U, rigidly secured in said tube by the screw V. Passing through said cap is the threaded suspensionrod W, provided with a hook at its lower end. Above the cap T is a nut, a. A setscrew, 7), passes through a sleeve on said nut and enters a score in an upward projection, c, on cap T. By turning the not a the rod Wmay be raised or lowered at will, and by tightening the setscrew Z2 said nut may be rigidly held at any point to which it may be adjusted.

To the hook at the end of rod Wis attached a fiber, d, which supports the mirror 0.

The parts above described are assembled as follows: Tube K is inserted in spool J, the threaded periphery of the tube entering the threaded bore of the spool at f. The flange L then fits snugly against the inner face of spool J. Spool J is then inserted in place in the ring-seat in the standard shell A, with the slit M exactly vertical. The suspension-fiber d,

to which the reflecting-mirror is secured in the usual way, then comes in line with this slit, and the magnet 0 is adjusted so as to be freely suspended in tube K, as shown. Spool J is then placed in the ring-seat in shell A, so that its inner face also meets the flange L. Tube P is inserted in the bore of spool J and receives the threaded extremity of tube K. By turning tube P the two tubes are drawn together, and inasmuch as the tube K is threaded in the spool J and the flange of tube P bears against the exterior of spool J the two spools are simultaneously approximated, so that the shouldered edges of their outer disks are brought closely against the outer rims of the shell A.

At h and i are arranged binding-screws, to which one terminal of each coil I is connected in any suitable manner. The other two coilterminals may be united or taken to a suitable switch or other device for varying the connec tion of the coils. Sliding upon the tube T is a sleeve, j. Pivoted in this sleeve isa cam, is, provided with alever, Z, and a spring, m. The springm normally acts to throw the upper end of the lever Z outward, and so to cause the cam to bear upon the tube and prevent movement of the sleeve j thereon; but by pushing inward the end of lever Z by hand the cam is is turned so as to allow of the sleeve j to be adjusted at any desired point on said tube. The sleeve j supports a flanged collar, a, which rests upon and rotates freely on said sleeve, and secured to said collar by screws 9) is a disk-magnet, 0, polarized, as indicated in Fig. 4. This magnet serves for adjusting the rice dle and regulating the sensitivencss of the instrument in the manner now wellknown. By means of the construction above described it may be rotated l'reel y on its center or raised and lowered on the tube T, or it may be individually removed from said tube without requiring the removal of its supports likewise by simply lifting the collar a from its supporting-sleeve.

For convenience in adjusting the spools J J in the shell A, I provide at the edge of the shell on each side two fixed pins, (1 (1, Fig. 1, which enter suitable recesses made in the edge of the outer disks of said spools.

I claim 1. In an electrical measuring-instrument, two parallel coils, a tubular core extending through both coils, and a magnet supported in said core and between said coils, substantially as described.

2. In an electrical measuring-instrument, two parallel coils, a tubular core extending through both coils and closed at both ends by translucent material, and a magnet supported in said core and between said coils, substantially as described.

3. In an electrical measuring-instrument, two parallel coils, a tubular core passing through both coils, a spacing plate or flange surrounding said core and interposed between said coils, and a magnet supported in said core and between said coils, substantially as described.

4. In an electrical measuring-instrument, two parallel coils, tubular cores in said coils, means for connecting the end of one of said cores to the end of the other core, and a magnet within the tubular cavity formed by said cores and between said coils, substantially as described.

5. In an electrical measuring-instrument, two parallel coils, a tubular core secured in one of said coils and having a projecting threaded extremity entering the aperture in said second coil, and within said second coil a tubular core flanged or shouldered to bear upon the outside of said second coil and threaded to receive the end of said first-named core, substantially as described.

6. In an electrical measuring-instrument, two parallel coils, a tubular core secured in one of said coils and having a projecting threaded extremity entering the aperture n said second coil, a tubular core within said second coil flanged or shouldered to bear upon the outside of said coil and threaded to receive the end of said first-namcd core, and a flange surrounding said first-named core and interposed between said coils, substantially as described.

7. In an electrical measuring-instrument, a standard having a ring-seat, two bobbins or spools carrying coils and received in said seat, a tubular core passing through said spools and provided with a slot or opening in its side, and a magnet suspended in said core, the suspending-filament of said magnet passing through a space or interval between the inner faces or said spools and through said slot in said core, substantially-as described.

8. In an electricalmeasuririg-instrument, a standard having a Vertical ring-seat, two bobbins or spools carrying-coils and received in said seat, a tubular core passing through said spools, a spacing disk or flange surrounding said core and having a radial slot or opening communicating with a slot or opening in the wall of said core, and a magnet suspended in said core, the inner faces of said spools being arranged in contact with opposite sides of said spacing-disk and the suspending-filament of said magnet passing through the space or interval between said faces and through the slot in said disk and opening in said core-wall, substantially as described.

9. In an electrical measuring-instrument, a standard, a ring-seat therein, two coil-carrying bobbins or spools received in said seat and having outer flanges bearing upon the external rims of saidv seat, a screw centrally disposed in one bobbin, and a nut similarly located in the other bobbin and receiving said screw, the said screw and nut operating to draw the bobbins together and to force their flanges against said rims, substantially as described.

10. In an electrical measuring-instrument, a vibrating magnet-needle and a controlling-magnet in disk form, substantially as described.

11. In an electrical measuring-instrument, a hollow standard, a vibrating magnet-needle suspended by a filament inelosed in said standard, and a eontrollingmagnet in disk form supported concentrically with and upon said standard and free to rotate thereon, substantially as described.

12. In an electrical measuring-instrument, a

hollow standard, a vibrating magnet-needle suspended by a filament inelosed in said standard, and a vertically-adjustable controllingmagnet in disk form supported concentrically with and upon said standard and free to rotate thereon, substantially as described. v

18. In an electrical measuringinstrument, a

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vibrating magnet-needle, a standard, and a controlling-magnet in disk form supported concentrically with and upon said standard above said needle, substantially as described.

14. The combination, in an electrical measuring instrument, with a vibrating magnetneedle and supporting-standard thereof, of a sleeve adjustable upon said standard and a controlling-magnet detachably supported upon said sleeve, substantially as described.

15. The combination, in an electrical measuring-instrument,with a vibrating magnet and supporting-standard thereof, of a sleeve adjustable upon said standard, a means (such as a clamp) for securing the said sleeve in adjusted position, and a controlling-magnet detachabl y supported on said sleeve, substantially as described.

16. The combination, in an electrical measuring-instrument, with a vibrating magnet- 20 needle and supporting-standard, of the sleeve j and disk-controlling magnet 0, provided with the collar at, substantially as described.

17. The combination, in an electrical measuring-instrument, With a vibrating needle and 25 supportingstandard thereof, of the sleeve 7', cam is, and dislccontrolling magnet 0, provided with the collar 11, substantially as described.

EDWARD WESTON.

Witnesses:

D. H. DRIscoLL, PARK BENJAMIN. 

